arXiv:0709.3531 [math.AP]AbstractReferencesReviewsResources
On the Hopf Lemma
Published 2007-09-21, updated 2007-09-28Version 2
The Hopf Lemma for second order elliptic operators is proved to hold in domains with $C^{1,\alpha}$, and even less regular, boundaries. It need not hold for $C^1$ boundaries. Corresponding results are proved for second order parabolic operators.
Comments: This paper has been withdrawn, since the result had been proved earlier
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